Matthew 18:16
But if he does not listen [to your reasoning], take one or two other people with you, so that two or three witnesses can verify every word [that was said].
2 Corinthians 13:1
This will be my third visit to you. [Deut. 19:15 says], "Every matter should be settled by the testimony of two or three witnesses."
1 Timothy 5:19
Do not listen to an accusation against an elder unless it comes from two or three witnesses.
Hebrews 10:28
The person who has disregarded the law of Moses is put to death without being shown mercy on the testimony of two or three witnesses.
John 8:17-18
Even in your law it is written [Deut. 19:15] that the testimony of two people is true.